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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b145f99e793f34d7c1b2a3d2496fff76952b74bd9257aa1f990e8538b6b2fd' 
  AND token = 'OoLTaYpjj2iqCZyqnbcMV6A0sMZ1rmNJp2Ay7wgWgxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}